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----- HISTORICAL RECORD -----

Mk 55 bottom mine

Country of Origin: USA

The Mk 55 was a U.S. modified aircraft bomb that was employed as an aircraft-laid bottom mine in shallow waters. It appeared in several mods, which differed primarily in firing mechanisms.

The Mk 55 could be laid at depths of up to 150 ft (46 m); Mod 2 and 7 mines could be laid at depths of up to 600 ft (183 m). The mines could also be laid by surface ships using portable rails.

No longer in service.

Initial operational capability (IOC) was reached in 1961. The production run...

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